Whale Strum Box – Bilge Pump Non‑Return StrainerWhale Strum Box Bilge Pump Strainer with NonReturn ValvePrevent blockages and backflow in your bilge pump system with the Whale Strum Box, designed for use with either manual or electric pumps. Choose from topentry (for deeper bilges) or sideentry (for shallow installations). Made from durable plastic (polypropylene), it fits 25 mm or 38 mm (1 1) hoses, includes a removable strainer screen, and features an internal nonreturn valve to prevent

High-output audio performance

Versatile mounting – suitable for deck or mast installations

this block is ideal for vangs

NZ-made galvanised build – corrosion-resistant and rugged

and improved reliability compared with older analogue battery isolators

This block is ideal where you need maximum mechanical advantage without the added bulk of larger hardware

Safe boating guides commonly cover trip planning

Built for durability and performance in New Zealand’s marine environments

Engineered for New Zealand boating conditions

Perfect for sailors who demand maximum mechanical advantage

🔧 Specifications at a glance:

This block features a 16mm UV-stabilised Delrin® sheave riding on stainless steel ball bearings